NARBERTH, Pa. (CBS) — A 21-year-old Montgomery County woman is facing theft and forgery charges, accused of stealing checks from the Main Line family where she babysat over a nearly two-year period.

Narberth police say the employer came forward after receiving a call from her bank about suspicious activity on her checking account.

Police say their investigation pointed to the babysitter, identified as Marisa Pompilio of Glenside, Pa. Authorities say she was forging checks, then cashing them at a bank near her home.

Montgomery County district attorney Risa Ferman says people hiring babysitters and nannies are looking for people they can trust with their children’s safety, “but we also want people we can trust inside of our homes with valuables. “You want to bring someone into your home that will not steal from you and someone like was able to come into the home and compromise the finances of the family.”

Police say they have more than $5,000 in fake checks. They also believe Pompilio had accomplices. And they say she worked for other families, so the investigation is ongoing.